版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/mao0514/article/details/86211075
https://blog.csdn.net/czc1009/article/details/12913759
https://blog.csdn.net/ytaosky/article/details/72820329
雷神代码：
工程下载：https://download.csdn.net/download/mao0514/10909202
// simplest_ffmpeg_streamer.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <stdio.h>
#define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
#define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
#define AVFMT_RAWPICTURE 0x0020
#define __STDC_CONSTANT_MACROS
#ifdef _WIN32
//Windows
extern "C"
{
#include "libavformat/avformat.h"
#include "libavutil/mathematics.h"
#include "libavutil/time.h"
};
#endif
int main(int argc, char *argv[])
{
AVOutputFormat *ofmt = NULL;
AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
AVPacket pkt;
const char *in_filename, *out_filename;
int ret, i;
int videoindex = -1;
int frame_index = 0;
int64_t start_time = 0;
in_filename = "test.flv";
out_filename = "rtmp://localhost/publishlive/livestream";
//注册所有组件
av_register_all();
//注册网络相关的组件
avformat_network_init();
/*
打开输入视频文件,并获得其一些相关信息(&AVFormatContext(双重指针函数), 输入文件名,
强制指定AVFormatContext中AVInputFormat的。这个参数一般情况下可以设置为NULL，这样FFmpeg可以自动检测AVInputFormat
,附加的一些选项，一般情况下可以设置为NULL)
*/
if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0)
{
printf("Could not open input file.");
goto end;
}
//获取视频文件相关信息，错误时返回值为-1
if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
printf("Failed to retrieve input stream information");
goto end;
}
//nb_streams：输入视频的AVStream个数
for (i = 0; i < ifmt_ctx->nb_streams; i++) {
//ifmt_ctx->stream[i]，输入视频的AVStream[]数组，具体结构见ppt上的介绍。标记为视频类型
if (ifmt_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
videoindex = i;
break;
}
}
//打印ifmt_ctx里面的具体信息,0代表是input, 1代表是output
av_dump_format(ifmt_ctx, 0, in_filename, 0);
/*
用于初始化AVFormatContext结构体
ctx：函数调用成功之后创建的AVFormatContext结构体。
oformat：指定AVFormatContext中的AVOutputFormat，用于确定输出格式。如果指定为NULL，可以设定后两个参数（format_name或者filename）由FFmpeg猜测输出格式。
PS：使用该参数需要自己手动获取AVOutputFormat，相对于使用后两个参数来说要麻烦一些。
format_name：指定输出格式的名称。根据格式名称，FFmpeg会推测输出格式。输出格式可以是“flv”，“mkv”等等。
filename：指定输出文件的名称。根据文件名称，FFmpeg会推测输出格式。文件名称可以是“xx.flv”，“yy.mkv”等等。
函数执行成功的话，其返回值大于等于0。
*/
avformat_alloc_output_context2(&ofmt_ctx, NULL, "flv", out_filename);
if (!ofmt_ctx) {
printf("Could not create output context\n");
ret = AVERROR_UNKNOWN;
goto end;
}
//AVOutputFormat类型
ofmt = ofmt_ctx->oformat;
for (i = 0; i < ifmt_ctx->nb_streams; i++) {
//根据输入流创建输出流
AVStream *in_stream = ifmt_ctx->streams[i];
//创建输出码流的AVStream
AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
if (!out_stream) {
printf("Failed allocating output stream\n");
ret = AVERROR_UNKNOWN;
goto end;
}
//拷贝输入视频码流的AVCodecContex的数值到输出视频码流的AVCodecContex
ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
//失败返回-1
if (ret < 0) {
printf("Failed to copy context from input to output stream codec context\n");
goto end;
}
//AVCodecContex的codec_tag
out_stream->codec->codec_tag = 0;
//设置AVOutputFormat的文件头的类型
if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
//打印一下ofmt_ctx里面的具体信息，最后的1代表是output, 0代表是input
av_dump_format(ofmt_ctx, 0, out_filename, 1);
//打开输出URL（Open output URL）
if (!(ofmt->flags & AVFMT_NOFILE)) {
//打开输出文件
ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
if (ret < 0) {
printf("Could not open output URL '%s'", out_filename);
goto end;
}
}
//写文件头
ret = avformat_write_header(ofmt_ctx, NULL);
if (ret < 0) {
printf("Error occurred when opening output URL\n");
goto end;
}
//获取
start_time = av_gettime();
//对AVStream[]数组的操作
while (1) {
AVStream *in_stream, *out_stream;
//从输入文件读取一个AVPacket
ret = av_read_frame(ifmt_ctx, &pkt);
if (ret < 0)
break;
//pts 显示时间戳
if (pkt.pts == AV_NOPTS_VALUE) {
//time_base AVStream的时间基
AVRational time_base1 = ifmt_ctx->streams[videoindex]->time_base;
//r_frame_rate AVStream的帧率
int64_t calc_duration = (double)AV_TIME_BASE / av_q2d(ifmt_ctx->streams[videoindex]->r_frame_rate);
pkt.pts = (double)(frame_index*calc_duration) / (double)(av_q2d(time_base1)*AV_TIME_BASE);
//dts 解码时间戳
pkt.dts = pkt.pts;
//duration 输入视频的时长，在AVFormatContext结构体中
pkt.duration = (double)calc_duration / (double)(av_q2d(time_base1)*AV_TIME_BASE);
}
//Delay，具体变量意义见上文
if (pkt.stream_index == videoindex) {
AVRational time_base = ifmt_ctx->streams[videoindex]->time_base;
AVRational time_base_q = { 1,AV_TIME_BASE };
int64_t pts_time = av_rescale_q(pkt.dts, time_base, time_base_q);
int64_t now_time = av_gettime() - start_time;
if (pts_time > now_time)
//延时函数，为了使时间戳能与解码出来的图像相对应
av_usleep(pts_time - now_time);
}
//AVStream
in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[pkt.stream_index];
//copy packet
//转换PTS/DTS
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
pkt.pos = -1;
//Print to Screen
if (pkt.stream_index == videoindex) {
printf("Send %8d video frames to output URL\n", frame_index);
frame_index++;
}
//将AVPacket（存储视频压缩码流数据）写入文件
ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
if (ret < 0) {
printf("Error muxing packet\n");
break;
}
//销毁指针，释放内存
av_free_packet(&pkt);
}
//写文件尾
av_write_trailer(ofmt_ctx);
end:
//销毁AVFormatContext指针，释放内存
avformat_close_input(&ifmt_ctx);
//close output
if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE)) {
avio_close(ofmt_ctx->pb);
}
//销毁AVOutputFormat指针，释放内存
avformat_free_context(ofmt_ctx);
if (ret < 0 && ret != AVERROR_EOF) {
printf("ERROR occurred.\n");
return -1;
}
}
return 0;
}
修改后的：
//push( "d:\\temp\\test.264","rtmp://192.168.1.105:1935/live/test");
int push(char* input_str, char* output_str)
{
AVOutputFormat *ofmt = NULL;
AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
AVPacket pkt;
int ret, i;
//FFmpeg av_log() callback
// av_log_set_callback(custom_log);
av_register_all();
//Network
avformat_network_init();
//Input
if((ret = avformat_open_input(&ifmt_ctx, input_str, 0, 0)) < 0)
{
printf( "Could not open input file.");
goto end;
}
// LOGI("avformat_find_stream_info");
if((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0)
{
printf( "error to retrieve input stream information");
goto end;
}
//Output
avformat_alloc_output_context2(&ofmt_ctx, NULL,"flv",output_str); //RTMP
//avformat_alloc_output_context2(&ofmt_ctx, NULL,"mpegts", output_str);//UDP
if(!ofmt_ctx)
{
printf( "Could not create outputcontext\n");
ret= AVERROR_UNKNOWN;
goto end;
}
ofmt =ofmt_ctx->oformat;
int videoindex = -1;
for(i =0; i<ifmt_ctx->nb_streams; i++)
if(ifmt_ctx->streams[i]->codec->codec_type ==AVMEDIA_TYPE_VIDEO)
{
videoindex = i;
break;
}
//Create output AVStream according to input AVStream
AVStream *in_stream = ifmt_ctx->streams[videoindex];
AVStream *out_stream = avformat_new_stream(ofmt_ctx,in_stream->codec->codec);
if(!out_stream)
{
printf( "Error occurred when allocating output stream\n");
ret= AVERROR_UNKNOWN;
goto end;
}
//Copythe settings of AVCodecContext
ret =avcodec_copy_context(out_stream->codec, in_stream->codec);
if (ret< 0)
{
printf( "error to copy context from input to output stream codeccontext\n");
goto end;
}
out_stream->codec->codec_tag = 0;
if(ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
//Openoutput URL
if(!(ofmt->flags & AVFMT_NOFILE))
{
ret= avio_open(&ofmt_ctx->pb, output_str, AVIO_FLAG_WRITE);
if(ret < 0)
{
printf( "Could not open output URL '%s'", output_str);
goto end;
}
}
//Writefile header
ret =avformat_write_header(ofmt_ctx, NULL);
if (ret< 0)
{
printf( "Error occurred when opening output URL : %d\n", ret);
goto end;
}
int frame_index = 0;
int64_t start_time = av_gettime();
while(1)
{
AVStream *in_stream, *out_stream;
//Get an AVPacket
ret= av_read_frame(ifmt_ctx, &pkt);
if(ret < 0)
break;
if(pkt.stream_index != videoindex)
{
av_free_packet(&pkt);
continue;
}
//FIX：NoPTS (Example: Raw H.264)
//Simple Write PTS
if(pkt.pts == AV_NOPTS_VALUE)
{
//Write PTS
AVRational time_base1 = ifmt_ctx->streams[videoindex]->time_base;
//Duration between 2 frames (us)
int64_t calc_duration =(double)AV_TIME_BASE/av_q2d(ifmt_ctx->streams[videoindex]->r_frame_rate);
//Parameters
pkt.pts =(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
pkt.dts = pkt.pts;
pkt.duration =(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
}
//Important:Delay
if(pkt.stream_index == videoindex)
{
AVRational time_base = ifmt_ctx->streams[videoindex]->time_base;
AVRational time_base_q = {1,AV_TIME_BASE};
int64_t pts_time = av_rescale_q(pkt.dts, time_base, time_base_q);
int64_t now_time = av_gettime() - start_time;
if (pts_time > now_time)
av_usleep(pts_time - now_time);
}
in_stream =ifmt_ctx->streams[pkt.stream_index];
out_stream = ofmt_ctx->streams[pkt.stream_index];
/*copy packet */
//Convert PTS/DTS
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base,out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
pkt.dts = pkt.pts;//av_rescale_q_rnd(pkt.dts, in_stream->time_base,out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base,out_stream->time_base);
pkt.pos = -1;
//Print to Screen
if(pkt.stream_index == videoindex)
{
printf("Send %8d video frames to output URL\n",frame_index);
frame_index++;
}
ret= av_interleaved_write_frame(ofmt_ctx, &pkt);
if(ret < 0)
{
printf( "Error muxing packet\n");
break;
}
av_free_packet(&pkt);
}
//Writefile trailer
av_write_trailer(ofmt_ctx);
end:
avformat_close_input(&ifmt_ctx);
/*close output */
if(ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
avio_close(ofmt_ctx->pb);
avformat_free_context(ofmt_ctx);
if (ret< 0 && ret != AVERROR_EOF)
{
printf( "Error occurred.\n");
return -1;
}
return 0;
}